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What are the average LTO8 speeds I can expect?
Just curious what people are seeing. We are backing up about 150TB of footage, and getting about 265MB/sec. Just curious if that is egregiously slow or about what is to be expected (this is my first extended LTO8 setup). We are doing a TB3 GRaid XL on Mac to Windows P5 server via 10GbE, so I expect some overhead, but I wasn’t sure how close to the spec 360MB/sec people were able to get in practice (especially with video data).
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4 Replies
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Transfer speeds of 360MB/s are using a full height LTO-8 drive. Some vendors incorrectly quote this figure, however for half height drives the speed is 300MB/s. You should see ~305MB/s with most video data. With compression enabled, files like ARI, DPX and CINE will transfer 5 to 10% faster.
Martin
CTO
YoYotta.com
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Verify read speeds from TB3 raid using Blackmagic disk speed test. Write to tape won’t go any faster. Also the block size set in the P5 storage pool might be increased for more throughput.
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So given the platform to platform and all the other overhead I’m probably not going to see a huge difference. I’ll take a look at block size and see if that make a notable difference on the next run (finishing a 75TB job this week, and then starting an 85TB job).
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I’ve used Yoyotta to backup to a Tandberg half height SAS LTO drive. Done nearly a Petabyte so far. Done backups from 4-bay and 8-bay TB3 RAIDs, 2.5″ SSDs, NVMe SSDs, 2xSSD RAIDs and fo course just drives. So, devices with read speeds from 150 MB/s to 1,500 MB/s.
Backup speed doesn’t exceed 300 MB/s. Its faster with a small number of large files (Sony Venice) compared to a large number of small files (Arriraw).
I usually do Quick verify not full verify. If verify is a must, I call back the tapes a few months later when my machines are free, and do a verify run.
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